Dual-mode cordless phone base



FIG. 1 is a top perspective view of a dual-mode cordless phone base showing our new design;

FIG. 2 is a side view thereof;

FIG. 3 is a front view thereof; and,

FIG. 4 is a back view thereof.

The broken line showing of environment in the drawings is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a dual-mode cordless phone base, as shown and described. 